Unrelated to your question, but the tweet "AI research has been heating up for years, with no signs of slowing down" is a bit disingenuous by showing stuff happening only after 2010 (while "parameters for machine learning models" are shown from 1950 onwards).

There's been multiple AI winters, and it would be wise not to sweep them under the rug.

That would be a "double exponential function".

https://en.wikipedia.org/wiki/Double_exponential_function

super-exponential?

log log linear? :D